Influence of supporting electrolyte activity on formal potentials measured for dissolved internal standards in acetonitrile

Osmotic coefficients are determined for tetra- n-butylammonium perchorate (TBAClO 4) in acetonitrile. Pitzer equations are fit to the data, and the resulting fitting parameters are used to calculate activity coefficients for TBAClO 4. The activity coefficients are used to control electrolyte activit...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2001-02, Vol.498 (1), p.192-200
Main Authors: Redepenning, Jody, Castro-Narro, Efrain, Venkataraman, Guhanand, Mechalke, Eric
Format: Article
Language:English
Subjects:
Acetonitrile
Activity
Chemistry
Electrochemistry
Exact sciences and technology
Ferrocene
Ferrocenium
General and physical chemistry
Kinetics and mechanism of reactions
Silver
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Summary:Osmotic coefficients are determined for tetra- n-butylammonium perchorate (TBAClO 4) in acetonitrile. Pitzer equations are fit to the data, and the resulting fitting parameters are used to calculate activity coefficients for TBAClO 4. The activity coefficients are used to control electrolyte activities so that the junction potential across a permselective anion exchanger is near zero. An electrochemical cell containing this junction is used to examine the influence of electrolyte activity on the formal potentials measured for ferrocene/ferrocenium and decamethylferrocene/decamethylferrocenium. It is clear that the oxidized forms of both redox couples are ion-paired with perchlorate anions in the supporting electrolyte and that this ion-pairing has a significant influence on the formal potentials.
ISSN:1572-6657
1873-2569
DOI:10.1016/S0022-0728(00)00393-4